2003 Volume 48 Issue 4 Pages 405-419
The purpose of this study was to investigate the relationships between kinematics and kinetics during sprint running, and isokinetic maximal strength of the lower limb. Sixteen male sprinters (100 m time : 10.88 ± 0.26 s) ran 60 m at maximal effort and their movements were recorded with a high-speed video camera in order to obtain the kinematic data. Ground reaction force was measured, and the joint peak torque and torque power at the right hip, knee and ankle were calculated. Isokinetic maximal strength was measured during concentric and eccentric flexion / extension of the hip, knee and anle joints at 30, 180 and 300 deg/s. The results were as follows : 1) THere were significant correlations between sprinting speed and maximal knee extension velocity during the support phase (r=-0.52, P<0.05), joint torpue of hip flexion during the recovery phase (r-0.55, p<0.05), joint torque of hip extension during the recovery phase (r=0.55, p<0.05), joint torque of knee extension during the support phase (r=0.58, p<0.05), and joint of ankle plantarflexion during the support phase (r=0.59, p<0.05). 2) There were significant correlations between isokinetic strength of hip flexion (concentric : all angular velocities, eccentric : 30 deg/s) and joint torque of hip extension during the recovery phase (r=0.53-0.64, p<0.05-0.01). Isokinetic strength of knee flexion (concentric : 180 deg/s, eccentric : all angular velocities) and joint torque of knee flexion during the recovery phase were also correlated significantly (r=0.50-0.64, p<0.05-0.01). Furthermore, there were significant correlations between isokinetic strength of plantarflexion (concentric : 180 and 300 deg/s) and joint torque of plantarflexion during the supports phase (r=0.56 and 0.64, p<0.05 and 0.01, respectively). 3) There were significant correlations between sprinting speed and isokinetic strength of flexion and extension at the hip and knee (r=0.50-0.72, p<0.05-0.01). From these results, it is suggested that isokinetic maximal strength of the lower limb influence kinematics and kinetics during sprint running. Therefore strength training is one of the keys for changing the sprinting movement subsequent to high sprint running performance.
